Re: [photo-3d] Re: Hyperstereo artists?, aerial topography

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

Yes, this was a typo.  I had originally written it as 0.625 to 1.250km, but
decided that looked a little too technical, and metric units of that value
are more often written in meters.  Somehow the "k" escaped deletion in this
conversion.

Regarding your location of residence, I was referring not to satellite
images, but to the aerial images made of the entire United States by the U.
S. Coast and Geodetic survey for generating topographic maps.

JR

----- Original Message -----
From: "Brian Reynolds" <reynolds@xxxxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Monday, October 23, 2000 10:31 AM
Subject: Re: [photo-3d] Re: Hyperstereo artists?, aerial topography


> John A. Rupkalvis wrote:
> > Regarding satellite imagery, the resolution, while astounding, still
> > cannot match that of aircraft flying at 1,000 to 2,000 feet altitude
> > (625 to 1250km).
> >
>
> I think you meant 625-1250m (approx. 2000-4100 feet), not kilometers.
>
> > Also, the other problem with satellite photography is that some part
> > of the world is always covered with cloud cover, so it is not
> > possible to cover all areas in the same pass.  Rather, mosaics are
> > gradually built up from "sections" as they are revealed.
> >
> > This is why I question whether the entire world has been covered at
> > this time.  With today's technology it might be easier to get full
> > coverage of the moon or Mars than the earth.
> >
>
> The moon has been done several times over the years.  Most recently by
> Clementine and Lunar Prospector.  Mars has been mapped a fewtime, but
> it also has seasonal conditions (sand storms) that cause problems with
> sattelite images.
>
> > Also, I feel that it is quite likely that most if not all of us live
> > in areas that have been covered and are available, since high
> > security areas are usually restricted as to public access, let alone
> > residency.
> >
>
> Actually I live in a part of Queens (a borough of NYC) that seems to
> have rather spotty coverage (based on various online satellite image
> resources).
>
> Of course if you've seen Men in Black you know that I live near where
> they store the UFOs, and that could explain everything.
>
> --
> Brian Reynolds                  | "Dee Dee!  Don't touch that button!"
> reynolds@xxxxxxxxx              | "Oooh!"
> http://www.panix.com/~reynolds  |    -- Dexter and Dee Dee
> NAR# 54438                      |       "Dexter's Laboratory"
>
>
>
>